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MAURICE GANDY, OF NEW BRIGHTON, COUNTY OF CHESTER, ASSIGNOR TO THE GANDY BELT MANUFACTURING COMPANY, (LIMITED) OF LIVER- POOL, ENGLAND.

BELT FOR DRlVlNG MACHINERY.

SPECIFICATION forming part of Letters Patent No. 356,933, dated February 1, 1887.

Application filed October 27, 1886. Serial No. 217,341. (No specimens.)

To (r whom it may concern:

Be it known that I, llIAURICE Gunny, a subject of the Queen of Great Britain, residing at New Brighton, in the county of Chester, England, have invented certain new and useful Improvements in Belts for Driving Machinery, of which the following is a de scription in such full, clear, concise, and exact terms as to enable any one skilled in the arts to which my invention belongs to make and use the same.

My invention relates to the manufacture of belts composed of cotton, canvas, or duck.

It has been and is now a common and well known practice to make bolts for driving machinery of cotton, canvas, or duck by first folding the canvas on the line of its warp to the desired width and thickness, and to then stitch it either zigzag or longitudinally, the belt being subsequently soaked in linseed-oil, after which it is pressed, stretched, and dried, and is then usually covered with a coat of paint. In the manufacture of these belts, as above stated, the oilis used to protect the belt against dampness and atmospheric changes, to soften the canvas,and keep it from mildewing. Vfithout the oil the belt would be impracticable, for the reason that it would expand and contract by reason of atmospheric changes, absorb water and mildew, out itself to pieces on the pulley when made of hard woven canvas, as it necessarily must be to be of any practical value, the belt being otherwise so stretchy and sleazy as to be wanting in gripping power upon the pulley.

Now, the object of my invention is to dispense with the use of the oil in the manufacture of the belt, and still retain those qualities in the belt which are imparted to it by the oil, the oil being a dirty and expensive element in the manufacture of the belt.

To accomplish the above-mentioned object, I take the canvas before it is made in the form of abelt and soak it in a solution of soap and water, in the proportion of about one pound of soap to one gallon of water, the canvas being then allowed to dry. I then soak it in a solution of alumina sulphate and water mixed in the proportion of about two pounds of the alumina to one gallon of water, the canvas being again allowed to dry. The canvas is then made in the form of a belt, and stitched after the ordinary method of making such belts. The surface of the belt may then be painted or not, as circumstances may require. I prefer 55 to paint it, as the belt not only wears better when painted, but it also draws better upon the pulley. A belt made in this way is thoroughly proof against dampness, atmospheric changes, mildewing, and cutting upon the pol 6o ley-s, as much so as if treated with oil, and is very much cheaper and cleaner to manufacture. The canvas may,of course, be treated with the soap-and-water solution and also with the alumiua-and-water solution after being made in the form of the belt, and the alumina solution may be applied before the soap solution has dried; but I prefer to make the belt as first above stated, as I think it yields more satisfactory results. There are also other waterproofing agents now well known to those skilled in the arts appertaining to such matters that may be used as a substitute for that mentioned-ms, for instance, the canvas may first be dipped in a solution of roclcalum 7 5 and acetate of lead, to which isadded an ounce of acetic acid to each gallon of said mixture, and the canvas subsequently passed through lime water; or the canvas may be passed through a solution containing about a pound of pot-ash, alum, acetate of lead, bicarbonate of potash,and sulphate of soda, in equal parts, to a gallon of water added to and thoroughly mixed with a solution of soap, substantially such as described, and then dried. After the treatment of the belt as above described, it may be passed through a solution of equal parts of hydrochlorate of ammonia (std-ammonia) and borax, and then dried as before, thus rendering the canvas practically fire-proof; but I prefer the solutions and methods of treatment I have specified as yielding very satisfactory results. My invention is, however, intended to include all that class of agents now well known to the arts as suitable for this purpose. 5 In making the solutions above specified, I have given the proportions which I have found thus far to yieldthe best results. Further experience may show that these proportions may be varied somewhat to advantage without [00 departing from the spirit or substance of my improvements in the belt.

In making thebeltthe canvas may, of course, be woven the width the belt is to be when finished, or it may be woven in wide sheets or bolts and folded to the width and thickness desired in the belt; but I prefer to have it woven just the width I want the belt to be when finished, with a selvage on each edge, and to lay these layers one on top ofthe other until the desired thickness and strength of belt is obtained.

Abelt made as above described possesses not only the qualities I have above pointed out, but it will resist also a high degree of heat, thus protecting it not only against the barometrical changes but also against thermal changes, the belt being practically fire-proof, as well as waterproof. Indeed, a belt treated with soap and alumina sulphate, as hereinbefore set forth, is absolutely proof against thermal changes. A belt treated with oil subjected to a high degree of heat will eventually lose its initial pliability and elasticity as the oil becomes dry; besides it is always inflammable, whereas a belt treated with soap and alumina sulphate may be subjected to a high degree of heat for any length of time without its initial pliability and elasticity being im- 0 paired, and it is never inflammable.

Having now described my invention,I claim and desire to secure by Letters Patent the following:

1. A water-proof belt for driving machinery, made of fibrous or textile material, treated with soap and alumina sulphate, or their equivalent, substantially as and for the purpose set forth.

2. Awater-proof belt for driving machinery, made of fibrous or textile material,treated with soap and alumina sulphate, or their equivalent, and also treated with a fireproofing agent, such as hydrochlorate of ammonia and borax, substantially as described.

3. A water-proof belt for driving machinery, consisting of the following elements in combination, viz: hard woven canvas or duck, two or more thicknesses ofsueh canvas orduck stitched together, and a waterproofing agent,

such as alumina sulphate and soap, and a I coat of paint with which the belt is covered, substantially as described.

MAURICE GANDY.

WVitnesses:

Gno. P. VEsT, W'. J. SULIs,

U. S. Consulate. 

